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Titolo:
MEASUREMENT OF SINGLE-PHOTON PRODUCTION IN E(- COLLISIONS NEAR THE Z(0) RESONANCE()E)
Autore:
AKERS R; ALEXANDER G; ALLISON J; ANDERSON KJ; ARCELLI S; ASAI S; ASTBURY A; AXEN D; AZUELOS G; BALL AH; BARBERIO E; BARLOW RJ; BARTOLDUS R; BATLEY JR; BEAUDOIN G; BECK A; BECK GA; BECKER J; BEESTON C; BEHNKE T; BELL KW; BELLA G; BENTKOWSKI P; BENTVELSEN S; BERLICH P; BETHKE S; BIEBER O; BLOODWORTH IJ; BOCK P; BOSCH HM; BOUTEMEUR M; BRAIBANT S; BRIGHTTHOMAS P; BROWN RM; BUIJS A; BURCKHART HJ; BURGARD C; CAPILUPPI P; CARNEGIE RK; CARTER AA; CARTER JR; CHANG CY; CHARLESWORTH C; CHARLTON DG; CHU SL; CLARKE PEL; CLAYTON JC; CLOWES SG; COHEN I; CONBOY JE; COUPLAND M; CUFFIANI M; DADO S; DALLAPICCOLA C; DALLAVALLE GM; DARLING C; DEJONG S; DENG H; DITTMAR M; DIXIT MS; SILVA EDE; DUBOSCQ JE; DUCHOVNI E; DUCKECK G; DUERDOTH IP; DUNWOODY UC; ELCOMBE PA; ESTABROOKS PG; ETZION E; EVANS HG; FABBRI F; FABBRO B; FANTI M; FIERRO M; FINCKEKEELER M; FISCHER HM; FISCHER P; FOLMAN R; FONG DG; FOUCHER M; FUKUI H; FURTJES A; GAGNON P; GAIDOT A; GARY JW; GASCON J; GEDDES NI; GEICHGIMBEL C; GENSLER SW; GENTIT FX; GERALIS T; GIACOMELLI G; GIACOMELLI P; GIACOMELLI R; GIBSON V; GIBSON WR; GILLIES JD; GOLDBERG J; GINGRICH DM; GOODRICK MJ; GORN W; GRANDI C; GRANNIS P; GROSS E; HAGEMANN J; HANSON GC; HANSROUL M; HARGROVE CK; HART J; HART PA; HAUSCHILD M; HAWKES CM; HEFLIN E; HEMINGWAY RJ; HERTEN G; HEUER RD; HILL JC; HILLIER SJ; HILSE T; HINSHAW DA; HOBSON PR; HOCHMAN D; HOCKER A; HOMER RJ; HONMA AK; HOWARD R; HUGHESJONES RE; HUMBERT R; IGOKEMENES P; IHSSEN H; IMRIE DC; JAWAHERY A; JEFFREYS PW; JEREMIE H; JIMACK M; JONES M; JONES RWL; JOVANOVIC P; JUI C; KARLEN D; KAWAGOE K; KAWAMOTO T; KEELER RK; KELLOGG RG; KENNEDY BW; KING B; KING J; KLUTH S; KOBAYASHI T; KOBEL M; KOETKE DS; KOKOTT TP; KOMAMIYA S; KOWALEWSKI R; KRIEGER P; VONKROGH J; KYBERD P; LAFFERTY GD; LAFOUX H; LAHMANN R; LAUBER J; LAYTER JG; LEBLANC P; LEDU P; LEE AM; LEFEBVRE E; LEHTO MH; LELLOUCH D; LEROY C; LETTS J; LEVINSON L; LI Z; LIU F; LLOYD SL; LOEBINGER FK; LONG GD; LORAZO B; LOSTY MJ; LOU XC; LUDWIG J; LUIG A; MANNELLI M; MARCELLINI S; MARKUS C; MARTIN AJ; MARTIN JP; MASHIMO T; MATTIG P; MAUR U; MCKENNA J; MCMAHON TJ; MCNAB AI; MCNUTT JR; MEIJERS F; MERRITT FS; MES H; MICHELINI A; MIDDLETON RP; MIKENBERG G; MILDENBERGER J; MILLER DJ; MIR R; MOHR W; MOISAN C; MONTANARI A; MORI T; MORII M; MULLER U; NELLEN B; NIJJHAR B; ONEALE SW; OAKHAM FG; ODORICI F; OGREN HO; ORAM CJ; OREGLIA MJ; ORITO S; PANSART J; PATRICK GN; PEARCE MJ; PFISTER P; PHILLIPS PD; PILCHER JE; PINFOLD J; PITMAN D; PLANE DE; POFFENBERGER P; POLI B; POSTHAUS A; PRITCHARD TW; PRZYSIEZNIAK H; REDMOND MW; REES DL; RIGBY D; RISON M; ROBINS SA; ROBINSON D; RONEY JM; ROS E; ROSSBERG S; ROSSI AM; ROSVICK M; ROUTENBURG P; ROZEN Y; RUNGE K; RUNOLFSSON O; RUST DR; SASAKI M; SBARRA C; SCHAILE AD; SCHAILE O; SCHARF F; SCHARFFHANSEN P; SCHENK P; SCHMITT B; VONDERSCHMITT H; SCHRODER M; SCHULTZCOULON HC; SCHUTZ P; SCHULZ M; SCHWICK C; SCHWIENING J; SCOTT WG; SETTLES M; SHEARS TC; SHEN BC; SHEPHERDTHEMISTOCLEOUS CH; SHERWOOD P; SIROLI GP; SKILLMAN A; SKUJA A; SMITH AM; SMITH TJ; SNOW GA; SOBIE R; SPRINGER RW; SPROSTON M; STAHL A; STEGMANN C; STEPHENS K; STEUERER J; STOCKHAUSEN B; STROHMER R; STROM D; SZYMANSKI P; TAKEDA H; TAKESHITA T; TAREM S; TECCHIO M; TEIXEIRADIAS P; TESCH N; THOMSON MA; TOWERS S; TSUKAMOTO T; TURNERWATSON MF; VANDENPLAS D; VANKOOTEN R; VASSEUR G; VINCTER M; WAGNER A; WAGNER DL; WARD CP; WARD DR; WARD JJ; WATKINS PM; WATSON AT; WATSON NK; WEBER P; WELLS PS; WERMES N; WILKENS B; WILSON GW; WILSON JA; WINTERER VH; WLODEK T; WOLF G; WOTTON S; WYATT TR; YEAMAN A; YEKUTIELI G; YURKO M; ZEUNER W; ZORN GT;
Indirizzi:
UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS MANCHESTER M13 9PL LANCS ENGLAND UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV BOLOGNA,DIPARTIMENTO FIS I-40126 BOLOGNA ITALY INFN I-40126 BOLOGNA ITALY UNIV BONN,INST PHYS D-53115 BONN GERMANY UNIV CALIF RIVERSIDE,DEPT PHYS RIVERSIDE CA 92521 UNIV CAMBRIDGE,CAVENDISH LAB CAMBRIDGE CB3 0HE ENGLAND CARLETON UNIV,DEPT PHYS OTTAWA ON K1S 5B6 CANADA CARLETON UNIV,PARTICLE PHYS RES CTR OTTAWA ON K1S 5B6 CANADA CERN,EUROPEAN ORG PARTICLE PHYS CH-1211 GENEVA 23 SWITZERLAND UNIV CHICAGO,ENRICO FERMI INST CHICAGO IL 60637 UNIV CHICAGO,DEPT PHYS CHICAGO IL 60637 UNIV FREIBURG,FAK PHYS D-79104 FREIBURG GERMANY UNIV HEIDELBERG,INST PHYS D-69120 HEIDELBERG GERMANY INDIANA UNIV,DEPT PHYS BLOOMINGTON IN 47405 UNIV LONDON,UNIV LONDON QUEEN MARY & WESTFIELD COLL LONDON E1 4NS ENGLAND UNIV LONDON BIRKBECK COLL LONDON WC1E 7HV ENGLAND UNIV COLL LONDON LONDON WC1E 6BT ENGLAND UNIV MARYLAND,DEPT PHYS COLLEGE PK MD 20742 UNIV MONTREAL,PHYS NUCL LAB MONTREAL PQ H3C 3J7 CANADA UNIV OREGON,DEPT PHYS EUGENE OR 97403 RUTHERFORD APPLETON LAB DIDCOT OX11 0QX OXON ENGLAND CE SACLAY,CEA,DAPNIA SPP F-91191 GIF SUR YVETTE FRANCE TECHNION ISRAEL INST TECHNOL,DEPT PHYS IL-32000 HAIFA ISRAEL TEL AVIV UNIV,DEPT PHYS & ASTRON IL-69978 TEL AVIV ISRAEL UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS TOKYO 113 JAPAN UNIV TOKYO,DEPT PHYS TOKYO 113 JAPAN KOBE UNIV KOBE 657 JAPAN BRUNEL UNIV UXBRIDGE UB8 3PH MIDDX ENGLAND WEIZMANN INST SCI,DEPT PARTICLE PHYS IL-76100 REHOVOT ISRAEL UNIV HAMBURG,DESY,INST EXPTL PHYS 2 D-22607 HAMBURG GERMANY UNIV VICTORIA,DEPT PHYS VICTORIA BC V8W 3P6 CANADA UNIV BRITISH COLUMBIA,DEPT PHYS VANCOUVER BC V6T 1Z1 CANADA UNIV ALBERTA,DEPT PHYS EDMONTON AB T6G 2J1 CANADA DUKE UNIV,DEPT PHYS DURHAM NC 27708 RHEIN WESTFAL TH AACHEN,INST PHYS 3 D-52056 AACHEN GERMANY
Titolo Testata:
Zeitschrift fur Physik. C, Particles and fields
fascicolo: 1, volume: 65, anno: 1995,
pagine: 47 - 65
SICI:
0170-9739(1995)65:1<47:MOSPIE>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
INVISIBLE WIDTH; E+E COLLISIONS; OPAL EXPERIMENT; HIGGS-BOSON; Z0 DECAY; LEP; NEUTRINO; DETECTOR; SEARCH; ANNIHILATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
51
Recensione:
Indirizzi per estratti:
Citazione:
R. Akers et al., "MEASUREMENT OF SINGLE-PHOTON PRODUCTION IN E(- COLLISIONS NEAR THE Z(0) RESONANCE()E)", Zeitschrift fur Physik. C, Particles and fields, 65(1), 1995, pp. 47-65

Abstract

A measurement of the single photon production cross-section is presented based on a data-sample of 40.5 pb(-1) collected with the OPAL detector at centre-of-mass energies within 3 GeV of the Z(0) mass. Single photon events arise from initial state radiation and the production ofan ''invisible'' final state consisting of neutrinos or possibly particles such as sneutrinos or photinos. The single photon topology is also sensitive to new Z(0) decays such as Z(0) --> <(nu)over bar>nu --><(nu)over bar nu gamma or Z(0) --> gamma X, X --> invisible particles. A total of 447 single photon candidates were observed with energy exceeding 1.75 GeV in the polar angle region \cos theta\ < 0.7. The estimated background from processes with visible reaction products, mainlye(+)e(-) --> e(+)e(-)gamma, is 37 +/- 6 events. Interpreting the cross-sections as being solely due to Z(0) decay to invisible particles and the expected W-contributions, the Z(0) invisible width is determinedto be 539 +/- 26 +/- 17 MeV corresponding to N-nu = 3.23 +/- 0.16 +/-0.10 light neutrino generations. The differential cross-section with photon energy is presented. Upper limits are set on additional invisible contributions to the Z(0) width, on possible non-resonant processes, and on Z(0) decays to single photons. The energy spectra are used toconstrain exotic sources of high energy single photons. In particular, the radiative two-body decay of the Z(0) to a new particle X, with mass below 64 GeV and an invisible signature, has a Z(0) branching ratio of less than 4.3 x 10(-6) at 95 % confidence level.

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Documento generato il 30/11/20 alle ore 12:18:43